Factual error: When Luke is playing video games in the camp he is using a Playstation controller, however when he pauses the game it shows a message telling him to push the 'B' button. 'B' buttons appear on Xbox games consoles rather than Playstations.
Factual error: The Athena Parthenos is a bad copy, she should hold a smaller statue of Nikè in her right hand, but she holds her spear.
Continuity mistake: When the bus passes Poseidon and he disappears, the people walking near him also disappear. There is an Asian couple walking from left to right across the shot that should have been still there after Poseidon is gone. Sloppy SFX that sort of spoils the effect of a god being able to vanish.
Annabeth Chase: I definitely have strong feelings for you. I just haven't decided if they're positive or negative yet.
Answer: Water creature? The Hydra is a MYTHOLOGICAL creature, with many different variations in different stories. She lived in a swamp, had bad breath. This is just another different interpretation of the same Greek myth.
GalahadFairlight